JPH05323338A - Liquid crystal electrooptical device - Google Patents

Abstract

PURPOSE:To make the contrast and visual angle of a screen better than the contrast and visual angle of a simple matrix system by forming the electrodes of at least one side of substrates by holding and laminating insulating films in a part thereof in the thickness direction thereof. CONSTITUTION:The signal electrodes to be formed on the transparent insulating substrate 2 are formed of the quadrisected structures consisting of the first signal electrodes 6a, 6a' and the second signal electrodes 6b, 6b' formed by being electrically separated therefrom via insulating films 7b, 7b'. Insulating films 7a, 7c, 7c' are provided to maintain the specified height of the first signal electrodes 6a, 6a' and the signal electrodes 6b, 6b' from the substrate 2. The driving of a liquid crystal is executed by impressing voltages to scanning electrodes 5 and the quadrisected signal electrodes 6a, 6a', 6b, 6b'. Since picture elements are formed between the respective scanning electrodes 5 and the first signal electrodes 6a, 6a' and the second signal electrodes 6b, 6b', the data for one line of the signal electrodes can be quadrisected independently distributed. Then, the duty ratio for driving the one screen can attain the value of four times the value of the case the signal electrodes are not divided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal electro-optical device such as a liquid crystal display mounted on a personal computer.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal electro-optical device, a substrate having a large number of scanning electrodes formed on its surface and a substrate having a large number of signal electrodes formed on its surface face each other simply in a matrix form via liquid crystal. Was. A scan selection signal is sequentially applied to the scan electrodes for each electrode at a frequency that is about the frame frequency of about 70 Hz, which is about several times as high as the scan electrodes. By displaying the screen, the selection signal and the non-selection signal were applied to the plurality of signal electrodes facing the scanning electrodes to which the scanning selection signal was applied to display the screen.

[0003]

In the structure of the conventional liquid crystal electro-optical device, the number of scanning electrodes is about 200 to 48 in order to maintain the image quality when driven by the simple matrix driving method.
0 was the limit. As the number of scanning electrodes increased, the contrast and viewing angle narrowed. In addition, the two-screen driving method in which the screen is divided into two and driven is the limit, and further division driving cannot be performed structurally.

[0004]

In order to solve these problems, the present invention provides a substrate having a large number of scanning electrodes formed on its surface and a substrate having a large number of signal electrodes formed on its surface via liquid crystals. In the liquid crystal electro-optical device in which the electrodes are arranged to face each other in a matrix, at least one of the electrodes of the substrate is formed by laminating at least one insulating film in the thickness direction.

[0005]

As a result, the liquid crystal electro-optical device constructed as described above can have three or more screens, and the contrast and viewing angle can be increased.

[0006]

EXAMPLES The present invention will be described in detail below with reference to examples. (Embodiment 1) FIG. 1 is a top view of a liquid crystal electro-optical device according to the present invention. The scanning electrode substrate 1 on which the scanning electrodes are formed and the signal electrode substrate 2 on which the signal electrodes are formed are arranged so that the scanning electrodes 5 and the signal electrodes 6 formed on the respective surfaces face each other.

FIG. 2 is a cross-sectional view taken along the line AA 'in FIG. 1. A liquid crystal 3 is sealed by a seal 4 between a substrate 1 having scan electrodes and a substrate 2 having signal electrodes. .. Figure 3
FIG. 3 is a cross-sectional view taken along the line BB ′ of FIG. 2 and 3, the signal electrode 6 is formed on the transparent insulating substrate 2. The signal electrode 6 is electrically separated from the first signal electrodes 6a and 6a ′ formed on the substrate 2 via the insulating films 7b and 7b ′, and the second signal electrodes 6b and 6b ′ are formed.
Is divided into four parts. Insulating films 7a, 7a ', 7
c and 7c 'are provided to keep the height of the first electrode and the second electrode from the substrate constant. The liquid crystal is driven by applying a voltage to the scanning electrode 5 which is a scanning electrode and the signal electrode 6 which is divided into four, which is a signal electrode. Since a pixel is formed between each scanning electrode 5 and the first electrode and the second electrode which are the signal electrodes, the data for one line of the signal electrode 6 is 4
It can be divided and distributed independently. Therefore, the duty ratio for driving one screen can be four times as large as when the signal electrode is not divided.

(Embodiment 2) FIG. 4 is a sectional view of a liquid crystal electro-optical device according to the present invention, which is a sectional view of the same portion as FIG. 2 of Embodiment 1. The signal electrode 6 is formed on the transparent insulating substrate 2. The signal electrode 6 includes the first signal electrodes 6a and 6a ′ formed on the signal electrode substrate 2 and the insulating film 7
b and 7b ', the second signal electrodes 6b and 6b' are formed to be electrically separated from each other, and the third signal electrodes 6c are formed to be electrically separated from each other via insulating films 7d and 7d '. , 6
It is a configuration in which c ′ is divided into six. The insulating film 7a is provided to keep the heights of the first electrode, the second electrode, and the third electrode from the substrate constant. The liquid crystal is driven by applying a voltage to the scan electrode 5 which is a scan electrode and the signal electrode 6 which is divided into six, which is a signal electrode. Since pixels are formed between each scanning electrode 5 and the first electrode, which is a signal electrode, the second electrode, and the third electrode, the data for one line of the signal electrode 6 is divided into six and distributed independently. can do. Therefore, 1
The duty ratio for driving the screen can be a duty ratio 6 times that in the case where the signal electrodes are not divided.

As described above, the duty ratio can be infinitely increased by wiring the signal electrodes electrically separated from the first, second, third, fourth ... With the insulating film.

[0010]

As described above, the contrast and viewing angle of the screen are improved as compared with the simple matrix system having the conventional structure.

[Brief description of drawings]

FIG. 1 is a top view of a liquid crystal electro-optical device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a part 1A-A ′ of the first embodiment of the liquid crystal electro-optical device according to the present invention.

FIG. 3 is a cross-sectional view taken along line BB ′ in FIG. 2 of Example 1 of the liquid crystal electro-optical device according to the present invention.

FIG. 4 is a sectional view of a liquid crystal electro-optical device according to a second embodiment of the present invention.

[Explanation of symbols]

1 Scanning Electrode Substrate 2 Signal Electrode Substrate 3 Liquid Crystal 4 Seal 5 Scanning Electrodes 6a, 6a 'First Signal Electrodes 6b, 6b' Second Signal Electrodes 6c, 6c 'Third Signal Electrodes 7a, 7a', 7b, 7b ', 7c, 7c', 7d, 7
d'insulating film

Claims (1)

[Claims] 1. A pair of substrates, each having a plurality of stripe-shaped electrodes formed on the surface thereof, are arranged such that their electrode surfaces face each other with a liquid crystal interposed therebetween, and the stripe-shaped electrodes on the two substrates are In a liquid crystal electro-optical device in which pixels are formed at intersecting portions, the striped electrode on at least one substrate is insulated from a first electrode formed on the substrate and a part on the first electrode. The second electrode has a structure in which at least two electrodes electrically separated from each other through a film are laminated, and the first electrode is formed on the extension of the pixel formed by the second electrode in the stripe direction. A liquid crystal electro-optical device comprising a formed pixel.